Video tutorials
Narrated walkthroughs of Open Lab and of building tasks in the lab.js builder. Each has subtitles in 12 languages, chapters and a transcript, the files to follow along directly under the player, and a link to its docs page.
Files for this video
- ↓ conditions.jsonThe builder file this video starts from (the end of the previous video).
- ↓ to-open-lab.jsonThe builder file at the end of this video: the finished task, with the changed sentence.
The lab.js builder: a reaction-time task, step by step
From the builder to Open Lab
2:44 · narrated, with subtitles in 12 languages · recorded in November 2026
The finished task goes from the builder to Open Lab: saved as a task, previewed on the lab.js version participants get, its parameters shown as fields under Edit parameters in a study, and a changed version saved as revision 2.